The Outdoor Accents hex-head washer from Simpson Strong-Tie provides the decorative appearance of a bolt connection. Its patent-pending design enables a much easier installation time compared to through-bolting. The washer is code-listed (IAPMO). It is designed exclusively to fasten Outdoor Accents post bases, T and L straps and angles.. ACQ Rated Fastener: Yes. Fastener Callout Size: 0.220 in. x 3-1/2 in. or 5-1/2 in.. Fastener Color: Black. Fastener Material: Steel. Fastener Plating: Electro Galvanized Zinc. Fastener Type: Other. Finish Family: Black. Fits Bolt Size: #0. Grade: Not Graded. Measurement Standard: SAE. Measurement System: Inches. Package Quantity: 24. Product Weight (lb.): 0.18 lb. Returnable: 90-Day. Thread Pitch (mm): N/A - Inches Fastener. Thread Style: Box Thread. Threads Per Inch (TPI): N/A - Metric Fastener. Inside Diameter (in.): 0.76 in. Outside Diameter: 1-1/2 in. Size: 0.220 in. Fits Bolt Size: #0. Outside Diameter: 1-1/2 in. Fastener Type: Other. Fastener Material: Steel. Thread Style: Box Thread